Better error model

src/macos.rs

@@ -1,13 +1,13 @@
+use super::error::Error;
 use super::executor::Executor;
 use super::terminal::print_separator;
 use super::utils::Check;
-use failure;
 
 #[must_use]
 pub fn upgrade_macos(dry_run: bool) -> Option<(&'static str, bool)> {
     print_separator("App Store");
 
-    let success = || -> Result<(), failure::Error> {
+    let success = || -> Result<(), Error> {
         Executor::new("softwareupdate", dry_run)
             .args(&["--install", "--all"])
             .spawn()?